<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>404 Not Found</title>
    <!-- 引入样式 -->
    <link rel="stylesheet" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css"/>
    <style>
        .flex-container {
            display: flex;
            justify-content: center;
        }
    </style>
</head>
<body>
<div id="app">
    <div class="flex-container" style="margin-top: 200px;">
        <el-row>
            <el-col :span="24">
                <el-card>
                    <el-card-header>
                        <span>404</span>
                    </el-card-header>
                    <el-card-body>
                        <p>Sorry, the page you visited does not exist.</p>
                    </el-card-body>
                </el-card>
            </el-col>
        </el-row>
    </div>
</div>
</body>
<!-- import Vue before Element -->
<script src="https://unpkg.com/vue@2/dist/vue.js"></script>
<!-- import JavaScript -->
<script src="https://unpkg.com/element-ui/lib/index.js"></script>
<!-- import Axios -->
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script>
    new Vue({
        el: '#app',
        data: {
            msg: 'Hello World'
        }
    })
</script>
</html>